{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-29141", "assignerOrgId": "455daabc-a392-441d-aa46-37d35189897c", "state": "PUBLISHED", "assignerShortName": "NCSC.ch", "dateReserved": "2026-03-04T09:08:07.342Z", "datePublished": "2026-04-02T08:34:32.933Z", "dateUpdated": "2026-04-02T14:40:50.107Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "455daabc-a392-441d-aa46-37d35189897c", "shortName": "NCSC.ch", "dateUpdated": "2026-04-02T08:34:32.933Z"}, "title": "Bounded Subject Tag Sanitization", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-20", "description": "CWE-20 Improper Input Validation", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-473", "descriptions": [{"lang": "en", "value": "CAPEC-473 Signature Spoof"}]}], "affected": [{"vendor": "SEPPmail", "product": "Secure Email Gateway", "versions": [{"status": "affected", "version": "0", "lessThan": "15.0.3", "versionType": "custom"}], "defaultStatus": "unaffected"}], "cpeApplicability": [{"operator": "OR", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:seppmail:seppmail_secure_email_gateway:*:*:*:*:*:*:*:*", "versionStartIncluding": "0", "versionEndExcluding": "15.0.3"}]}]}], "descriptions": [{"lang": "en", "value": "SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to bypass subject sanitization and forge tags such as [signed OK].", "supportingMedia": [{"type": "text/html", "base64": false, "value": "SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to bypass subject sanitization and forge tags such as [signed OK]."}]}], "references": [{"url": "https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure-1503", "tags": ["release-notes"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 7.7, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N"}}], "timeline": [{"time": "2025-10-31T14:22:00.000Z", "lang": "en", "value": "Vulnerability disclosed to SEPPmail"}, {"time": "2026-03-03T00:00:00.000Z", "lang": "en", "value": "Version 15.0.3 released"}], "credits": [{"lang": "en", "value": "Andris Suter-D\u00f6rig", "type": "finder"}, {"lang": "en", "value": "Matteo Scarlata", "type": "coordinator"}, {"lang": "en", "value": "Kenny Paterson", "type": "coordinator"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "Vulnogram 0.5.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-04-02T14:40:30.793493Z", "id": "CVE-2026-29141", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-02T14:40:50.107Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-29141", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-04-02T14:40:30.793493Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-02T14:40:39.987Z"}}], "cna": {"title": "Bounded Subject Tag Sanitization", "source": {"discovery": "EXTERNAL"}, "credits": [{"lang": "en", "type": "finder", "value": "Andris Suter-D\u00f6rig"}, {"lang": "en", "type": "coordinator", "value": "Matteo Scarlata"}, {"lang": "en", "type": "coordinator", "value": "Kenny Paterson"}], "impacts": [{"capecId": "CAPEC-473", "descriptions": [{"lang": "en", "value": "CAPEC-473 Signature Spoof"}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 7.7, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "SEPPmail", "product": "Secure Email Gateway", "versions": [{"status": "affected", "version": "0", "lessThan": "15.0.3", "versionType": "custom"}], "defaultStatus": "unaffected"}], "timeline": [{"lang": "en", "time": "2025-10-31T14:22:00.000Z", "value": "Vulnerability disclosed to SEPPmail"}, {"lang": "en", "time": "2026-03-03T00:00:00.000Z", "value": "Version 15.0.3 released"}], "references": [{"url": "https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure-1503", "tags": ["release-notes"]}], "x_generator": {"engine": "Vulnogram 0.5.0"}, "descriptions": [{"lang": "en", "value": "SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to bypass subject sanitization and forge tags such as [signed OK].", "supportingMedia": [{"type": "text/html", "value": "SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to bypass subject sanitization and forge tags such as [signed OK].", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-20", "description": "CWE-20 Improper Input Validation"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:seppmail:seppmail_secure_email_gateway:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "15.0.3", "versionStartIncluding": "0"}], "operator": "OR"}], "operator": "OR"}], "providerMetadata": {"orgId": "455daabc-a392-441d-aa46-37d35189897c", "shortName": "NCSC.ch", "dateUpdated": "2026-04-02T08:34:32.933Z"}}}, "cveMetadata": {"cveId": "CVE-2026-29141", "state": "PUBLISHED", "dateUpdated": "2026-04-02T14:40:50.107Z", "dateReserved": "2026-03-04T09:08:07.342Z", "assignerOrgId": "455daabc-a392-441d-aa46-37d35189897c", "datePublished": "2026-04-02T08:34:32.933Z", "assignerShortName": "NCSC.ch"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Secure Email Gateway", "vendor": "SEPPmail", "versions": [{"lessThan": "15.0.3", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "vulnerability@ncsc.ch"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:seppmail:secure_email_gateway:*:*:*:*:*:*:*:*", "matchCriteriaId": "E3729650-81CA-4311-94BF-14A7A191F8D1", "versionEndExcluding": "15.0.3", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to bypass subject sanitization and forge tags such as [signed OK]."}, {"lang": "es", "value": "SEPPmail Secure Email Gateway antes de la versi\u00f3n 15.0.3 permite a un atacante eludir la sanitizaci\u00f3n del asunto y falsificar etiquetas como [signed OK]."}], "id": "CVE-2026-29141", "lastModified": "2026-10-26T21:10:00.170", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.7, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "HIGH", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "vulnerability@ncsc.ch", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-29141", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-02T14:40:30.793493Z", "version": "2.0.3"}}]}, "published": "2026-04-02T09:16:22.793", "references": [{"source": "vulnerability@ncsc.ch", "tags": ["Release Notes"], "url": "https://downloads.seppmail.com/extrelnotes/150/ERN15.0.html#seppmail-vulnerability-disclosure-1503"}], "sourceIdentifier": "vulnerability@ncsc.ch", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}], "source": "vulnerability@ncsc.ch", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,15.0.3)"}}], "enrichment": {"confidence": 87.0, "confidence_source": "matching", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 87.0, "source": "matching"}]}, "original": {"product": "Secure Email Gateway", "source": "cna", "vendor": "SEPPmail"}, "product": "seppmail_secure_email_gateway", "vendor": "seppmail"}], "analysis": {"en": {"generated_at": "2026-04-02T10:51:50.979941+00:00", "value": {"mitigation_remediation": ["Apply the vendor patch or upgrade to SEPPmail Secure Email Gateway version 15.0.3 or later"], "summary": {"action": "Immediate Patch", "impact": "Subject Tag Forgery via Sanitization Bypass"}, "threat_synthesis": {"affected_systems": "Affected software is SEPPmail Secure Email Gateway, a secure email filtering and forwarding appliance that processes inbound email traffic. All deployments running a version earlier than 15.0.3 are vulnerable; deployments on 15.0.3 or later have the flaw fixed as noted in the vendor's release notes.", "description_and_impact": "SEPPmail Secure Email Gateway versions prior to 15.0.3 contain a bounded input validation flaw that permits attackers to bypass the system's subject sanitization logic and insert specially crafted subject tags such as [signed OK]. Because the gateway accepts and processes subject headers from inbound email, the forged tags can trick recipients into believing messages are authenticated or have been reviewed, potentially enabling phishing, social engineering, or other deceptive email campaigns. The weakness is a classic input validation error classified as CWE\u201120 and directly affects email authenticity.", "risk_and_exploitability": "The CVSS base score of 7.7 indicates a high severity, reflecting the potential for widespread impact on client trust. The EPSS score is not provided, and the issue is not listed in the CISA KEV catalog, suggesting no publicly known exploitation at the time of disclosure. The likely attack vector is remote, via crafted email applicants that bypass subject sanitization when sent to the gateway over the network; no special privileges or insider access appear required. As the flaw permits tampering with email headers that are propagated to end recipients, the risk to confidentiality is low, but the integrity of the email authentication process is compromised, enabling phishing attacks."}}}}, "created": "2026-04-02T20:15:31.132006+00:00", "updated": "2026-04-02T20:22:06.766999+00:00", "vendors": ["seppmail", "seppmail$PRODUCT$seppmail_secure_email_gateway"]}